Table 1 53 {continued). 

 STANDARD WAVE-LENGTHS. KAYSER'S IRON (ARC) LINES. 



r = easily reversible. 



i;5 



Taken from Kayser's Handbuch der Spectroscopic. 

 * For reducing to Fabry and Buisson's system o£ wave-lengths see Table 149 (the accepted standard, igo8) ; tem- 

 perature 15° C, pressure 760 mm. 



Smithsonian Tables. 



